the new one way scheme ____for just over six months,and traffic has imoroved considerably as a result.
问题描述：
the new one way scheme ____for just over six months,and traffic has imoroved considerably as a result.
A.has been operated B.has to be operated C.has been operating D.had operating
为什么选C?
答
这项新的单行道计划已经运行六个多月了,交通状况大为缓解
C have/has been doing 这是现在完成进行时态 表示动作从过去开始,一直延续到现在,并有可能继续延续下去.
如：it has been raining for 3 days
雨已经下了三天（三天前开始,一直下到现在,还在继续）
他和完成时态的区别就在于,还要继续.
这道题目,明显提醒这个项目还要继续
.
我猜你选了A,scheme operate 不用被动的
不懂的话请hi我